Gratuitous shiny head pics......

MW heads have the same short valves that non-MW heads have so the port height at the short turn isn’t very generous, and they don’t utilize offset rockers so the width at the pinch isn’t that wide either.
So, I guess I would say the shortcoming is not having enough area down stream of the opening to take advantage of it.

I didn’t want to do anything I felt would have caused a noticeable drop in the reliability of the casting........ so I would consider this a “normal” porting job.
They haven’t made these castings in a while, and untouched examples are hard to come by, and are expensive.
Since they are going on a motor for a car that will likely never see the drag strip, I really wasn’t trying to get every last cfm out of them.
I have no doubts that if someone applied a “super stock” level of effort to them, there is plenty of cfm left.
That’s just not my thing.
I’m not really trying to break new ground with porting.
I’m just trying to get what the basic design and shape will give me without feeling like I need to reinvent the head.
There are those who enjoy that type of challenge....... but that’s not me.